6 June 1944
Men of Luftflotte 3! The enemy has launched the long-announced invasion. Long have we waited for this moment, long have we prepared ourselves, both inwardly and on the field of battle, by untiring, unending toil. Our task is now to defeat the enemy. I know that each one of you, true to his oath to the colours, will carry out his duty. You, who enter my sphere of command as newly sworn-in or as seasoned fighters from the hard-defended Reich, and you, untiring fighters on the Channel, the Atlantic and the Mediterranean, you will all now be fighting side by side for the Fatherland, united in your sacred faith in victory. Great things will be asked of you, and you will show the greatest fighting valour. Salute the Führer. Your Commander-in-Chief, Sperrle, Generalfeldmarschall.
Before the Allied Invasion, III./SG 4 (Kommandeur, Maj. Gerhard Weyert) had been based in Southern France, looking for submarines in the Mediterranean. The 9. Staffel, for example had been "sub-hunting" from Le Luc since 18 May and was relieved by 7./SG 4 on 2 June; 8./SG 4’s Fw 190 A-6, W.Nr. 470604 had been received for repair at by AGO Cravant-Bazarnes on 15 May.
When the Allies landed, the Gruppe moved up to Laval (Mayenne), about 140 km. from the Anglo-Canadian beach heads, just within the radius of action for a bomb-carrying Fw 190. The deployment began badly when they were intercepted en route by American fighters, the unit's War Diary reporting four pilots killed and one wounded, with like casualties among ground crew being carried in the Focke-Wulfs’ rear fuselage compartments.
The Allies deciphered a succession of fragmentary reports about aircraft lost on that first day:
7 June 1944
At 07.30 hours, Laval was shot up by 12–15 Mustangs. No one was hurt but two "protective roofs" (aircraft shelters?) were burned down and four Fw 190s put out of action, one of which was:
Nevertheless, the Gruppe went into action that day, losing two aircraft:
The 9. Staffel's strength on 7 June was reported as 12 (9) aircraft and 12 (12) pilots.
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The fullest account of III./SG 4 in Normandy I know of is that given by Jean-Bernard Frappé in his La Luftwaffe face au débarquement allié (Éditions Heimdal, Bayeux 1999). The Kriegstagebuch of III./SG 4 for the Normandy campaign survives and a microfilm copy is held in the Imperial War Museum's Documents Collection.
Almost everything here is from deciphered German signals traffic and I haven't tried to incorporate material from the above sources. This is not a full account but it does have information that, so far as I know, you won't find published anywhere else.